DOI: 10.1038/s41561-020-00659-z
论文题名: Coupled anaerobic methane oxidation and reductive arsenic mobilization in wetland soils
作者: Shi L.-D. ; Guo T. ; Lv P.-L. ; Niu Z.-F. ; Zhou Y.-J. ; Tang X.-J. ; Zheng P. ; Zhu L.-Z. ; Zhu Y.-G. ; Kappler A. ; Zhao H.-P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 12 起始页码: 799
结束页码: 805
语种: 英语
英文关键词: arsenic
; bioinformatics
; gene expression
; genomics
; methanogenesis
; microcosm
; oxidation
; soil pollution
; wetland management
; China
英文摘要: Anaerobic methane oxidation is coupled to the reduction of electron acceptors, such as sulfate, and contributes to their biogeochemical cycling in the environment. However, whether arsenate acts as an alternative electron acceptor of anaerobic methane oxidation and how this influences global arsenic transformations remains elusive. Here, we present incubations of arsenate-contaminated wetland soils from seven provinces in China. Using isotopically labelled methane, we find that anaerobic methane oxidation was linked to arsenate reduction at a rate approaching the theoretical arsenic/methane stoichiometric ratio of 4. In microcosm incubations with natural wetland soils, we find that the coupled pathway of anaerobic methane oxidation and arsenate reduction contributed 26 to 49% of total arsenic release from soils, with arsenic in the more soluble and toxic form arsenite. Comparative gene quantification and metagenomic sequencing suggest that the coupled pathway was facilitated by anaerobic methanotrophs, either independently or synergistically with arsenate-reducing bacteria through reverse methanogenesis and respiratory arsenate reduction. Further bioinformatic analyses show that genes coding for reverse methanogenesis and respiratory arsenate reduction are universally co-distributed in nature. This suggests that coupling of anaerobic methane oxidation and arsenate reduction is a potentially global but previously overlooked process, with implications for arsenic mobilization and environmental contamination. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169677
Appears in Collections: 气候变化与战略
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作者单位: MOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, China; Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China; Center for Applied Geosciences, University of Tübingen, Tübingen, Germany
Recommended Citation:
Shi L.-D.,Guo T.,Lv P.-L.,et al. Coupled anaerobic methane oxidation and reductive arsenic mobilization in wetland soils[J]. Nature Geoscience,2020-01-01,13(12)